//
// Created by zhouyi on 2019/9/13.
//

#include <stdio.h>
#include <math.h>


int main(void) {
    float radius = 0;
    printf("请输入的圆的半径0~100：\n");
    scanf("%f", &radius);
    printf("圆的面积是 %0.1f \n", 3.14f * pow(radius, 2));

    printf("圆的周长是 %0.1f \n", 3.14f * radius * 2);

    return 0;
}

